Lots of casting news this week, and here is a short summary of who will star in what soon:

• Sigourney Weaver and Alia Shawkat are joining John C. Reilly, Ed Helms and Anne Heche in Miguel Arteta's comedy "Cedar Rapids," about man (Helms) sent to represent his company and save his colleagues' jobs at a regional insurance conference in Cedar Rapids. (Variety)

• Gerard Butler ("Law Abiding Citizen") is in talks to join Ralph Fiennes' directorial debut "Coriolanus," an adaptation of William Shakespeare's Roman tragedy. Butler would play Tullus Aufidius, commander of the Volscian army. Also on board: Fiennes, William Hurt, Vanessa Redgrave and Jessica Chastain. (THR)

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Sigourney Weaver is in talks to join Greg Mottola's upcoming comedy "Paul," about two sci-fi freaks who encounter a real alien during a road trip to Area 51. The film also stars Seth Rogen, Jason Bateman, Kristen Wiig, Bill Hader, Jane Lynch, Simong Pegg and Nick Frost, with Rogen set to voice the alien. Variety says Weaver's role in the film would not be announced at this stage.

Weaver also recently joined the cast of Andy Fickman's upcoming Disney comedy "You Again," about a woman who discovers her brother is about to marry the girl (Weaver plays her rich aunt) who constantly bullied her in high school. Kristen Bell also stars in the film, which Dave Johnson and Moe Jelline wrote.

Weaver recently appeared in "Vantage Point" and "Baby Mama." She also did some voice work in "WALL-E" and "The Tale of Despereaux." Upcoming projects of hers include James Cameron's "Avatar" and possibly "Ghostsbusters III."

We all know "Ghostbusters III" is moving forward, but Dan Aykroyd recently spilled new details about the movie in an interview with the Los Angeles Times. The big news: Signourney Weaver is apparently on board, Aykroyd said. She will be joining Aykroyd, Bill Murray, Harold Ramis and Ernie Hudson in the third "Ghostbusrters" flick.

Details about where the story is heading are still unknown at this point, but Aykroyd said he'd like to see a new generation of Ghostbusters join the old guys. "Let's revisit the old characters briefly and happily and have them there as family but let's pass it on to a new generation," he told the LA Times.

Aykroyd said he would like to see a team with female members, and two actresses he likes in particular are Alyssa Milano and Eliza Dushku. Lee Eisenberg and Gene Stupnitsky, the co-executive producers of "The Office," are working on the "Ghostbusters III" script, and if everything plays out well enough, the film may shoot this winter.

Read more about what Aykroyd has to say about the film right here.